Flying jellyfish are monsters that can appear randomly on the Uncharted Isles. They can be killed for combat experience. They can hit hard and quickly with magic attacks, and are often clumped together in large groups, making it very dangerous to use area-of-effect attacks and abilities.

Attacking the jellyfish will scale their life points and combative abilities to the player's own combat level.

They will always be found near a pile of seaweed which acts as their respawn point.